device_scan.cuh

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/******************************************************************************
 * Copyright (c) 2011, Duane Merrill.  All rights reserved.
 * Copyright (c) 2011-2018, NVIDIA CORPORATION.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of the NVIDIA CORPORATION nor the
 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL NVIDIA CORPORATION BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 ******************************************************************************/

#pragma once

#include <stdio.h>
#include <iterator>

#include "dispatch/dispatch_scan.cuh"
#include "../util_namespace.cuh"

CUB_NS_PREFIX

namespace cub {


struct DeviceScan
{
    /******************************************************************/

    template <
        typename        InputIteratorT,
        typename        OutputIteratorT>
    CUB_RUNTIME_FUNCTION
    static cudaError_t ExclusiveSum(
        void            *d_temp_storage,                    
        size_t          &temp_storage_bytes,                
        InputIteratorT  d_in,                               
        OutputIteratorT d_out,                              
        int             num_items,                          
        cudaStream_t    stream              = 0,            
        bool            debug_synchronous   = false)        
    {
        // Signed integer type for global offsets
        typedef int OffsetT;

        // The output value type
        typedef typename If<(Equals<typename std::iterator_traits<OutputIteratorT>::value_type, void>::VALUE),  // OutputT =  (if output iterator's value type is void) ?
            typename std::iterator_traits<InputIteratorT>::value_type,                                          // ... then the input iterator's value type,
            typename std::iterator_traits<OutputIteratorT>::value_type>::Type OutputT;                          // ... else the output iterator's value type

        // Initial value
        OutputT init_value = 0;

        return DispatchScan<InputIteratorT, OutputIteratorT, Sum, OutputT, OffsetT>::Dispatch(
            d_temp_storage,
            temp_storage_bytes,
            d_in,
            d_out,
            Sum(),
            init_value,
            num_items,
            stream,
            debug_synchronous);
    }


    template <
        typename        InputIteratorT,
        typename        OutputIteratorT,
        typename        ScanOpT,
        typename        InitValueT>
    CUB_RUNTIME_FUNCTION
    static cudaError_t ExclusiveScan(
        void            *d_temp_storage,                    
        size_t          &temp_storage_bytes,                
        InputIteratorT  d_in,                               
        OutputIteratorT d_out,                              
        ScanOpT         scan_op,                            
        InitValueT      init_value,                         
        int             num_items,                          
        cudaStream_t    stream              = 0,            
        bool            debug_synchronous   = false)        
    {
        // Signed integer type for global offsets
        typedef int OffsetT;

        return DispatchScan<InputIteratorT, OutputIteratorT, ScanOpT, InitValueT, OffsetT>::Dispatch(
            d_temp_storage,
            temp_storage_bytes,
            d_in,
            d_out,
            scan_op,
            init_value,
            num_items,
            stream,
            debug_synchronous);
    }


    /******************************************************************/


    template <
        typename            InputIteratorT,
        typename            OutputIteratorT>
    CUB_RUNTIME_FUNCTION
    static cudaError_t InclusiveSum(
        void*               d_temp_storage,                 
        size_t&             temp_storage_bytes,             
        InputIteratorT      d_in,                           
        OutputIteratorT     d_out,                          
        int                 num_items,                      
        cudaStream_t        stream             = 0,         
        bool                debug_synchronous  = false)     
    {
        // Signed integer type for global offsets
        typedef int OffsetT;

        return DispatchScan<InputIteratorT, OutputIteratorT, Sum, NullType, OffsetT>::Dispatch(
            d_temp_storage,
            temp_storage_bytes,
            d_in,
            d_out,
            Sum(),
            NullType(),
            num_items,
            stream,
            debug_synchronous);
    }


    template <
        typename        InputIteratorT,
        typename        OutputIteratorT,
        typename        ScanOpT>
    CUB_RUNTIME_FUNCTION
    static cudaError_t InclusiveScan(
        void            *d_temp_storage,                    
        size_t          &temp_storage_bytes,                
        InputIteratorT  d_in,                               
        OutputIteratorT d_out,                              
        ScanOpT         scan_op,                            
        int             num_items,                          
        cudaStream_t    stream             = 0,             
        bool            debug_synchronous  = false)         
    {
        // Signed integer type for global offsets
        typedef int OffsetT;

        return DispatchScan<InputIteratorT, OutputIteratorT, ScanOpT, NullType, OffsetT>::Dispatch(
            d_temp_storage,
            temp_storage_bytes,
            d_in,
            d_out,
            scan_op,
            NullType(),
            num_items,
            stream,
            debug_synchronous);
    }


};

}               // CUB namespace
CUB_NS_POSTFIX  // Optional outer namespace(s)